As President Obama prepares to release a review of American strategy in Afghanistan that will claim progress in the nine-year-old war there, two new classified intelligence reports offer a more negative assessment and say there is a limited chance of success unless Pakistan hunts down insurgents operating from havens on its Afghan border.

The reports, one on Afghanistan and one on Pakistan, say that although there have been gains for the United States and NATO in the war, the unwillingness of Pakistan to shut down militant sanctuaries in its lawless tribal region remains a serious obstacle. American military commanders say insurgents freely cross from Pakistan into Afghanistan to plant bombs and fight American troops and then return to Pakistan for rest and resupply.

The findings in the reports, called National Intelligence Estimates, represent the consensus view of the United States' 16 intelligence agencies, as opposed to the military, and were provided last week to some members of the Senate and House Intelligence Committees. The findings were described by a number of American officials who read the reports' executive summaries.

Perhaps someone who knows better can accuse me of making a shallow comparison, but doesn't this sound exactly like the situation that plagued the US Army in Vietnam, where enemy fighters would hide out across the border in Cambodia? From Wikipedia:

The People's Army of Vietnam had been utilizing large sections of relatively unpopulated eastern Cambodia as sanctuaries into which they could withdraw from the struggle in South Vietnam to rest and reorganize without being attacked. These base areas were also utilized by the communists to store weapons and other material that had been transported on a large scale into the region on the Sihanouk Trail. PAVN forces had begun moving through Cambodian territory as early as 1963